// textarea 높이 자동 조절
$.fn.extend({
	txtaAutoHeight: function() {
		return this.each(function() {
			var $this = $(this);
			if (!$this.attr('initAttrH')) {
				$this.attr('initAttrH', $this.outerHeight());
			}
			setAutoHeight(this).on('input', function() {
				setAutoHeight(this);
			});
		});

		function setAutoHeight(elem) {
			var $obj = $(elem);
			return $obj.css({height: $obj.attr('initAttrH'), 'overflow-y': 'hidden'}).height(elem.scrollHeight);
		}
	}
});